简介：Thepurposeofthispaperistodevelopafunctionalmethodfordesigningaseriesofsubmergedbreakwatersonpracticaltopography.ThemethodisusedtoverifythefeasibilityandeffectivenessofBraggbreakwatersforcoastalprotectionbyusingfieldtopography.ThefirstpartofthispaperprovidesdefinitionsandproceduresneededinthedesignprocessforapplyingthemechanismofBraggreflection.Next,Braggbreakwatersaredesignedonthebasisofthecross-sectionaltopographyandthenontheplanetopographyoftheMi-Tuocoastbyfollowingtheproposedprocessandprocedure.Numericalmodeling(Hsuetal.,2003;WenandTsai,2008)wasusedasadesignandassessmenttool.Finally,theeffectivenessandfeasibilityofaBraggbreakwaterwasassessedbypracticalcases.BasedonthemechanismofBraggreflection,anoptimumlayoutforaseriesofsubmergedbreakwatersisproposedtoprotecttheMi-Tuocoast.Theresultsindicatethattheproperlayoutofaseriesofsubmergedcreakwaterscanachievetheobjectiveofbeachprotection.

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简介：Anumericalmodel,EvolutionEquationofMild-SlopeEquation(EEMSE)developedbyHsuetal.(2003),wasappliedtostudytheBraggreflectionofwaterwavesoveraseriesofrectangularseabed.ThreekeyparametersoftheBraggreflectionincludingthepeakcoefficientofprimaryBraggreflection,itscorrespondingrelativewavelength,andthebandwidth,haveshowntobeeffectiveindescribingthecharacteristicsoftheprimaryBraggreflection.ThecharacteristicsoftheBraggreflectionwereinvestigatedunderthevariousconditionscomprisingnumber,height,andspacingintervalofaseriesofrectangularseabed.TheresultsrevealthatthepeakofBraggreflectionincreaseswiththeincreaseofrectangularseabedheightandnumber,thebandwidthandtheshiftvalueoftheBraggreflectiondependontheincreaseoftherectangularseabedheightaswellasthedecreaseofrectangularseabednumber,andtherelativerectangularseabedspacingintherangof3and4couldproducehigherBraggreflection.Finally,acorrelativeandregressiveanalysisisperformedbyuseofthecalculateddata.Basedontheresultsoftheanalysis,empiricalequationswereestablished.Ourstudyresultscanprovideanappropriatechoiceofaseriesofrectangularseabedfieldforapracticaldesign.